my chevy cobalt keeps getting hot after changing thermostat

10

Asked by Mar 10, 2016 at 09:22 PM about the 2006 Chevrolet Cobalt LTZ

Question type: Maintenance & Repair

The engine from cold will heat up to 221 degrees then turn on the fan. It might cool down at first to 185-190 but then slowly creep up past 221 and hit 240 before I shut off the engine. The cooling fan is working normal and stays on at these extreme temps. I have replaced the thermostat and the coolant with dexcool, and made sure the system was purged of air bubbles. The car does not have any coolant leaks. I'm thinking it may have a plugged heater core restricting flow, I haven't pulled the heater core hoses off to see if it doesn't have good flow or done a chemical test to see if it's a head gasket issue. Has anyone else had these same symptoms and have any good pointers. i don't want to just start throwing parts at it if I have overlooked anything obvious.
Thanks

8 Answers

69,595

The heater core is not the issue,if fans is running right and there is no fluid lost,you have a bad water pump.

69,595

if it is a head issue,you will have coolant lost out of the tail pipe or in your oil,if you have none of these your pump is bad.

10

I didn't think a water pump could fail that way. I'm used to older motors that the pump is an impeller that doesn't wear out and the only failure is a leak at the bearing. I guess these newer cars have pumps made of plastic parts or impellers that are of a soft material?

69,595

No,there not plastic there metal impellar,but they where down and want pump right,change the pump,you will fix your issue,if you are not losing coolant.

Best Answer Mark helpful
10

Yeah it doesn't have the signs of typical head gasket issue, no white smoke or smell of coolant burning and no coolant in the oil either. Gonna change the pump and hope for the best. Thanks for the quick replies! Two heads are better than one sometimes.

1 of 1 people found this helpful.
69,595

You are welcome.

Did changing the water pump fix the issue?

Just so you know a plug heater core can cause a 2006 Chevy cobalt 2.2 to over heat the engine

Your Answer

Cobalt

Looking for a Used Cobalt in your area?

CarGurus has 3,504 nationwide Cobalt listings starting at $1,800.

ZIP:

Chevrolet Cobalt Experts

  • #1
    lightGear
    Reputation
    1,170
  • #2
    munron
    Reputation
    1,080
  • #3
    dandyoun
    Reputation
    970
View All

Related Models For Sale

Used Honda Civic
694 Great Deals out of 64,157 listings starting at $999
Used Chevrolet Malibu
1,008 Great Deals out of 62,968 listings starting at $880
Used Ford Focus
723 Great Deals out of 57,442 listings starting at $1,150
Used Chevrolet Impala
541 Great Deals out of 34,842 listings starting at $990
Used Toyota Corolla
868 Great Deals out of 59,960 listings starting at $850
Used Honda Accord
1,083 Great Deals out of 65,757 listings starting at $561
Used Ford Mustang
546 Great Deals out of 36,568 listings starting at $1,500
Used Chevrolet Silverado 1500
2,355 Great Deals out of 173,316 listings starting at $699
Used Dodge Charger
334 Great Deals out of 30,091 listings starting at $2,000
Used Ford Fusion
951 Great Deals out of 64,708 listings starting at $888
Used Toyota Camry
934 Great Deals out of 90,039 listings starting at $300
Used Nissan Altima
1,080 Great Deals out of 78,379 listings starting at $1,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.